149 lines
4.1 KiB
Fortran
149 lines
4.1 KiB
Fortran
|
subroutine foxgen()
|
||
|
|
|
||
|
|
! Called from MainWindow::foxTxSequencer() to generate the Tx waveform in
|
||
|
|
! FT8 Fox mode. The Tx message can contain up to 5 "slots", each carrying
|
||
|
|
! its own FT8 signal.
|
||
|
|
|
||
|
|
! Encoded messages can be of the form "HoundCall FoxCall rpt" (a standard FT8
|
||
|
|
! message with i3bit=0) or "HoundCall_1 RR73; HoundCall_2 <FoxCall> rpt",
|
||
|
|
! a new message type with i3bit=1. The waveform is generated with
|
||
|
|
! fsample=48000 Hz; it is compressed to reduce the PEP-to-average power ratio,
|
||
|
|
! with (currently disabled) filtering afterware to reduce spectral growth.
|
||
|
|
|
||
|
|
! Input message information is provided in character array cmsg(5), in
|
||
|
|
! common/foxcom/. The generated wave(NWAVE) is passed back in the same
|
||
|
|
! common block.
|
||
|
|
|
||
|
|
use crc
|
||
|
|
parameter (NN=79,ND=58,KK=87,NSPS=4*1920)
|
||
|
|
parameter (NWAVE=NN*NSPS,NFFT=614400,NH=NFFT/2)
|
||
|
|
character*40 cmsg
|
||
|
|
character*22 msg,msgsent
|
||
|
|
character*6 mygrid
|
||
|
|
character*87 cbits
|
||
|
|
character*88 cb88
|
||
|
|
logical bcontest
|
||
|
|
integer itone(NN)
|
||
|
|
integer icos7(0:6)
|
||
|
|
integer*1 msgbits(KK),codeword(3*ND),msgbits2
|
||
|
|
integer*1, target:: i1Msg8BitBytes(11)
|
||
|
|
integer*1, target:: mycall
|
||
|
|
real x(NFFT)
|
||
|
|
real*8 dt,twopi,f0,fstep,dfreq,phi,dphi
|
||
|
|
complex cx(0:NH)
|
||
|
|
common/foxcom/wave(NWAVE),nslots,nfreq,i3bit(5),cmsg(5),mycall(12)
|
||
|
|
common/foxcom2/itone2(NN),msgbits2(KK)
|
||
|
|
equivalence (x,cx),(y,cy)
|
||
|
|
data icos7/2,5,6,0,4,1,3/ !Costas 7x7 tone pattern
|
||
|
|
|
||
|
|
bcontest=.false.
|
||
|
|
fstep=60.d0
|
||
|
|
dfreq=6.25d0
|
||
|
|
dt=1.d0/48000.d0
|
||
|
|
twopi=8.d0*atan(1.d0)
|
||
|
|
mygrid=' '
|
||
|
|
irpt=0
|
||
|
|
nplot=0
|
||
|
|
wave=0.
|
||
|
|
|
||
|
|
do n=1,nslots
|
||
|
|
i3b=i3bit(n)
|
||
|
|
if(i3b.eq.0) then
|
||
|
|
msg=cmsg(n)(1:22) !Stansard FT8 message
|
||
|
|
else
|
||
|
|
i1=index(cmsg(n),' ') !Special Fox message
|
||
|
|
i2=index(cmsg(n),';')
|
||
|
|
i3=index(cmsg(n),'<')
|
||
|
|
i4=index(cmsg(n),'>')
|
||
|
|
msg=cmsg(n)(1:i1)//cmsg(n)(i2+1:i3-2)//' '
|
||
|
|
read(cmsg(n)(i4+2:i4+4),*) irpt
|
||
|
|
endif
|
||
|
|
call genft8(msg,mygrid,bcontest,0,msgsent,msgbits,itone)
|
||
|
|
! print*,'Foxgen:',n,cmsg(n),msgsent
|
||
|
|
|
||
|
|
if(i3b.eq.1) then
|
||
|
|
icrc10=crc10(c_loc(mycall),12)
|
||
|
|
nrpt=irpt+30
|
||
|
|
write(cbits,1001) msgbits(1:56),icrc10,nrpt,i3b,0
|
||
|
|
1001 format(56b1.1,b10.10,b6.6,b3.3,b12.12)
|
||
|
|
read(cbits,1002) msgbits
|
||
|
|
1002 format(87i1)
|
||
|
|
|
||
|
|
cb88=cbits//'0'
|
||
|
|
read(cb88,1003) i1Msg8BitBytes(1:11)
|
||
|
|
1003 format(11b8)
|
||
|
|
icrc12=crc12(c_loc(i1Msg8BitBytes),11)
|
||
|
|
|
||
|
|
write(cbits,1001) msgbits(1:56),icrc10,nrpt,i3b,icrc12
|
||
|
|
read(cbits,1002) msgbits
|
||
|
|
|
||
|
|
call encode174(msgbits,codeword) !Encode the test message
|
||
|
|
|
||
|
|
! Message structure: S7 D29 S7 D29 S7
|
||
|
|
itone(1:7)=icos7
|
||
|
|
itone(36+1:36+7)=icos7
|
||
|
|
itone(NN-6:NN)=icos7
|
||
|
|
k=7
|
||
|
|
do j=1,ND
|
||
|
|
i=3*j -2
|
||
|
|
k=k+1
|
||
|
|
if(j.eq.30) k=k+7
|
||
|
|
itone(k)=codeword(i)*4 + codeword(i+1)*2 + codeword(i+2)
|
||
|
|
enddo
|
||
|
|
endif
|
||
|
|
|
||
|
|
! Make copies of itone() and msgbits() for ft8sim
|
||
|
|
itone2=itone
|
||
|
|
msgbits2=msgbits
|
||
|
|
f0=nfreq + fstep*(n-1)
|
||
|
|
phi=0.d0
|
||
|
|
k=0
|
||
|
|
do j=1,NN
|
||
|
|
f=f0 + dfreq*itone(j)
|
||
|
|
dphi=twopi*f*dt
|
||
|
|
do ii=1,NSPS
|
||
|
|
k=k+1
|
||
|
|
phi=phi+dphi
|
||
|
|
xphi=phi
|
||
|
|
wave(k)=wave(k)+sin(xphi)
|
||
|
|
enddo
|
||
|
|
enddo
|
||
|
|
enddo
|
||
|
|
kz=k
|
||
|
|
|
||
|
|
peak1=maxval(abs(wave))
|
||
|
|
wave=wave/peak1
|
||
|
|
! call plotspec(1,wave) !Plot the spectrum
|
||
|
|
|
||
|
|
! Apply compression
|
||
|
|
! rms=sqrt(dot_product(wave,wave)/kz)
|
||
|
|
! wave=wave/rms
|
||
|
|
! do i=1,NWAVE
|
||
|
|
! wave(i)=h1(wave(i))
|
||
|
|
! enddo
|
||
|
|
! peak2=maxval(abs(wave))
|
||
|
|
! wave=wave/peak2
|
||
|
|
|
||
|
|
! call plotspec(2,wave) !Plot the spectrum
|
||
|
|
|
||
|
|
width=50.0
|
||
|
|
call foxfilt(nslots,nfreq,width,wave)
|
||
|
|
peak3=maxval(abs(wave))
|
||
|
|
wave=wave/peak3
|
||
|
|
|
||
|
|
! nadd=1000
|
||
|
|
! j=0
|
||
|
|
! do i=1,NWAVE,nadd
|
||
|
|
! sx=dot_product(wave(i:i+nadd-1),wave(i:i+nadd-1))
|
||
|
|
! j=j+1
|
||
|
|
! write(30,3001) j,sx/nadd
|
||
|
|
!3001 format(i8,f12.6)
|
||
|
|
! enddo
|
||
|
|
|
||
|
|
! call plotspec(3,wave) !Plot the spectrum
|
||
|
|
|
||
|
|
return
|
||
|
|
end subroutine foxgen
|
||
|
|
|
||
|
|
! include 'plotspec.f90'
|